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</style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr /><td align="left" valign="top" width="32"><img align="left" border="0" height="32" src="images/rb-logo.png" width="32" /></td><td width="1">&#160;&#160;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&#160;&#183; <a href="classes.html"><font color="#004faf">All Classes</font></a>&#160;&#183; <a href="modules.html"><font color="#004faf">Modules</font></a></td></table><h1 align="center">QGraphicsSceneEvent Class Reference<br /><sup><sup>[<a href="qtgui.html">QtGui</a> module]</sup></sup></h1><p>The QGraphicsSceneEvent class provides a base class for all
graphics view related events. <a href="#details">More...</a></p>

<p>Inherits <a href="qevent.html">QEvent</a>.</p><p>Inherited by <a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a>, <a href="qgraphicsscenedragdropevent.html">QGraphicsSceneDragDropEvent</a>, <a href="qgraphicsscenehelpevent.html">QGraphicsSceneHelpEvent</a>, <a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a>, <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a>, <a href="qgraphicsscenemoveevent.html">QGraphicsSceneMoveEvent</a>, <a href="qgraphicssceneresizeevent.html">QGraphicsSceneResizeEvent</a> and <a href="qgraphicsscenewheelevent.html">QGraphicsSceneWheelEvent</a>.</p><h3>Methods</h3><ul><li><div class="fn" /><b><a href="qgraphicssceneevent.html#setWidget">setWidget</a></b> (<i>self</i>, QWidget&#160;<i>widget</i>)</li><li><div class="fn" />QWidget <b><a href="qgraphicssceneevent.html#widget">widget</a></b> (<i>self</i>)</li></ul><a name="details" /><hr /><h2>Detailed Description</h2><p>The QGraphicsSceneEvent class provides a base class for all
graphics view related events.</p>
<p>When a <a href="qgraphicsview.html">QGraphicsView</a> receives
Qt mouse, keyboard, and drag and drop events (<a href="qmouseevent.html">QMouseEvent</a>, <a href="qkeyevent.html">QKeyEvent</a>, QDragEvent, etc.), it translates
them into instances of QGraphicsSceneEvent subclasses and forwards
them to the <a href="qgraphicsscene.html">QGraphicsScene</a> it
displays. The scene then forwards the events to the relevant
items.</p>
<p>For example, when a <a href="qgraphicsview.html">QGraphicsView</a> receives a <a href="qmouseevent.html">QMouseEvent</a> of type MousePress as a response
to a user click, the view sends a <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a> of
type <a href="qevent.html#Type-enum">GraphicsSceneMousePress</a> to
the underlying <a href="qgraphicsscene.html">QGraphicsScene</a>
through its <a href="qgraphicsscene.html#mousePressEvent">mousePressEvent()</a>
function. The default <a href="qgraphicsscene.html#mousePressEvent">QGraphicsScene.mousePressEvent</a>()
implementation determines which item was clicked and forwards the
event to <a href="qgraphicsitem.html#mousePressEvent">QGraphicsItem.mousePressEvent</a>().</p>
<p>Subclasses such as <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a> and
<a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a>
provide the coordinates from the original <a href="qevent.html">QEvent</a> in screen, scene, and item coordinates
(see <a href="qgraphicsscenemouseevent.html#screenPos">screenPos()</a>, <a href="qgraphicsscenemouseevent.html#scenePos">scenePos()</a>, and
<a href="qgraphicsscenemouseevent.html#pos">pos()</a>). The item
coordinates are set by the <a href="qgraphicsscene.html">QGraphicsScene</a> before it forwards the
event to the event to a <a href="qgraphicsitem.html">QGraphicsItem</a>. The mouse events also add
the possibility to retrieve the coordinates from the last event
received by the view (see <a href="qgraphicsscenemouseevent.html#lastScreenPos">lastScreenPos()</a>,
<a href="qgraphicsscenemouseevent.html#lastScenePos">lastScenePos()</a>,
and <a href="qgraphicsscenemouseevent.html#lastPos">lastPos()</a>).</p>
<hr /><h2>Method Documentation</h2><h3 class="fn"><a name="setWidget" />QGraphicsSceneEvent.setWidget (<i>self</i>, <a href="qwidget.html">QWidget</a>&#160;<i>widget</i>)</h3><h3 class="fn"><a name="widget" /><a href="qwidget.html">QWidget</a> QGraphicsSceneEvent.widget (<i>self</i>)</h3><p>Returns the widget where the event originated, or 0 if the event
originates from another application.</p>
<address><hr /><div align="center"><table border="0" cellspacing="0" width="100%"><tr class="address"><td align="left" width="25%">PyQt&#160;4.9.1 for X11</td><td align="center" width="50%">Copyright &#169; <a href="http://www.riverbankcomputing.com">Riverbank&#160;Computing&#160;Ltd</a> and <a href="http://www.qtsoftware.com">Nokia</a> 2011</td><td align="right" width="25%">Qt&#160;4.8.0</td></tr></table></div></address></body></html>